APR vs interest rate: what the difference means
Nominal rates, effective rates and annual percentage rates can describe different things. A plain-language map of the distinctions.
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EMI
Calculate an equated monthly instalment and total interest.Loans
APR
Estimate an annualized borrowing rate including entered fees.Investments
Compound interest
Explore how a balance changes with contributions and an assumed rate.Investments
CAGR
Annualize a start-to-end change across an entered period.Investments
SIP
Model recurring monthly contributions under an assumed return.Investments
Retirement value
Model a future balance from savings and contribution assumptions.Options
Options Strategy Atlas
Explore option strategies by outlook, compare payoff shapes, and open any strategy to model its risks and returns.Taxes
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Inflation
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Percentage change
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Long Call
Buy a call for a defined upfront cost, with upside if the underlying rises above breakeven.Options
Covered Call
Long shares with a short call, exchanging upside for option premium.Options
Bull Call Spread
Long lower-strike call financed by short higher-strike call.Options
Bull Put Spread
Short higher-strike put with protective lower-strike put.Options
Protective Put
Long shares with long put establishing price floor.Options
Cash-Secured Put
Short put backed by cash sufficient for assignment.Options
Call Ratio Backspread
Short lower-strike call with two long higher-strike calls.Options
Bull Call Ladder
Bull call spread with additional short call at higher strike.Options
Synthetic Long Stock
Long call and short put at same strike mimic long stock.Options
Bullish Risk Reversal
Long call financed by short lower-strike put.Options
Synthetic Call
Long shares paired with a long put, replicating a long call's payoff while still holding the actual stock.Options
Long Put
Put purchase with defined premium at risk and downside.Options
Bear Put Spread
Long higher-strike put financed by short lower-strike put.Options
Bear Call Spread
Short lower-strike call with protective higher-strike call.Options
Covered Put
Short shares with short put limiting profit below strike.Options
Put Ratio Backspread
Short higher-strike put with two long lower-strike puts.Options
Bear Put Ladder
Bear put spread with additional short put.Options
Synthetic Short Stock
Short call and long put at same strike mimic short stock.Options
Long Straddle
Long call and put at same strike benefit from large move.Options
Long Strangle
Out-of-money call and put seek large move.Options
Strip
One long call and two long puts emphasize downside.Options
Strap
Two long calls and one long put emphasize upside.Options
Reverse Iron Condor
Bear put and bull call spreads seek movement beyond wings.Options
Reverse Iron Butterfly
Long spreads centered on strike seek movement from body.Options
Long Guts
In-the-money call and put create two-sided volatility.Options
Short Straddle
Short call and put at same strike benefit from flatness.Options
Short Strangle
Short OTM call and put create wider profit region.Options
Short Strap
Two short calls and one short put at one strike collect elevated premium, with risk skewed to the upside.Options
Iron Condor
Defined-risk put and call spreads create profit range.Options
Iron Butterfly
Short straddle with protective wings defining risk/reward.Options
Long Call Butterfly
Three-strike call structure concentrates payoff at middle.Options
Long Put Butterfly
Three-strike put structure concentrates payoff at middle.Options
Call Calendar Spread
Same-strike calls valued at the near-term expiry.Options
Put Calendar Spread
Same-strike puts valued at the near-term expiry.Options
Collar
Long shares with put floor and call ceiling.Options
Short Guts
Short ITM call and put seek limited movement.Options
Poor Man's Covered Call
Long-dated deep ITM call financed by a short-dated OTM call, approximating a covered call with less capital.02
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Featured calculation
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Compound interest adds calculated interest to both the original amount and accumulated interest. The calculator keeps contributions, rate, frequency and time separate.
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Notes from the financial reference desk
Formulas, terminology and methods—edited for ordinary reading.
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Money is written differently around the world.
Currency selection and locale-aware formatting change the presentation, not the underlying formula.
United States$1,234.56USD
Germany1.234,56 €EUR
India₹1,23,456.78INR
Japan¥123,457JPY
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Questions, answered plainly
The short version of how these calculators should be used.
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Formulas use the values you provide. Real outcomes can differ because rates, taxes, fees, timing and other conditions may change.
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